Rin Kujou is Saki Tenjouin's loyal and longest known friend. Rin is skilled in kendo and has been a loyal bodyguard to Saki for years, as her family has always served the Tenjouin family in this position. The bespectacled Aya Fujisaki is weak-willed and became associated with Saki after she and Rin protected her from bullies when they were children.

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Rin is generally expressionless and formal but can get really angry when it comes to Rito's clumsiness towards her, Aya, and most of all, Saki, who she is very loyal to. Although she has shown to smile practically once to Rito as a sign of understanding, it didn't last long due to another one of his mishaps. She thinks his sister is more reliable than he is. However, Rin began developing feelings with Rito in Darkness Chapter 33 when he saved her, and became more patient and grateful with him.

Rin has served Saki as her bodyguard, but Saki has always thought of her as a close friend instead. They first met when Rin came to Saki in the garden introducing herself as the daughter of the Tenjouin family's butler and then tells her that she will be serving her starting from that day. Saki acted friendly towards Rin and welcomed her company as her friend, and Rin was deeply touched by it. Although most of the time, Rin maintained a professional manner and service around Saki, she truly considers Saki as a close friend.

It was later revealed that Rin suffers from Acrophobia, the extreme or irrational fear of heights.

Swordsmanship: Rin is known to practice Kendo, and is often seen carrying a shinai. The only times she is seen using Kendo are either when training or when she's mad at Rito whenever his clumsiness results in him groping her, Saki or Aya. She has also beaten up the principal time from time. Because she does not involve herself with Rito, his alien friends or their adventures and antics, she is mostly left out of any potentially dangerous situation, and so the full extent of her expertise in Kendo has not yet been seen.

Marksmanship: On chapter 83, she has shown to also have some sharpshooting skills.